Muting apparatus

Details Muting apparatus Muting apparatus

1982-03-02

1985-01-15

Stellar, George G.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

360 741, 369 53, G11B 1518

Patent

active

044941587

ABSTRACT:
A tape recorder capable of sounding an alarm which indicates the end of run of a tape, includes a tape recorder control circuit which sends a first signal for effecting tape end muting and for sounding an end alarm. The first signal is supplied to a speaker through a power amplifier. The alarm issued from the speaker is sensed by a microphone and later acoustically fed back to the power amplifier through a microphone amplifier. The microphone amplifier has its gain substantially reduced to zero upon generation of the first signal. Even though an audible alarm is sounded, howling which may otherwise arise from the acoustic feedback of the alarm sound, is suppressed.

REFERENCES:
patent: 3518375 (1970-06-01), Hawkins
patent: 4232348 (1980-11-01), Satoh et al.

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